Error in (function (classes, fdef, mtable)  : 
  unable to find an inherited method for function ‘proj4string’ for signature ‘"character"’

Observations: 146,774
Variables: 14
$ calldatetime         <dttm> 2015-12-06 08:06:00, 2015-12-06 08:32:00, 2015-12-06 09:05:00, 2015-...
$ callnumber           <chr> "P153400663", "P153400693", "P153400741", "P153400743", "P153400750",...
$ description          <chr> "NARCOTICSOutside", "NARCOTICSOutside", "NARCOTICSOutside", "NARCOTIC...
$ district             <chr> "CD", "NW", "SD", "NW", "NW", "CD", "WD", "SW", "SW", "NW", "NW", "WD...
$ incidentlocation     <chr> "0 N HOWARD ST", "5400 BLK NARCISSUS AV", "1900 W LOMBARD ST", "BEAUF...
$ location_address     <chr> "0 N HOWARD ST", "5400 BLK NARCISSUS AV", "1900 W LOMBARD ST", "BEAUF...
$ location_city        <chr> "BALTIMORE", "BALTIMORE", "BALTIMORE", "BALTIMORE", "BALTIMORE", "BAL...
$ location_state       <chr> "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD", "MD...
$ priority             <chr> "Medium", "Medium", "Medium", "Medium", "Medium", "Medium", "Medium",...
$ recordid             <chr> "1000151", "1000177", "1000216", "1000219", "1000222", "1000247", "10...
$ location.type        <chr> NA, "Point", "Point", NA, NA, NA, NA, "Point", "Point", "Point", "Poi...
$ location.coordinates <list> [NULL, <-76.68436, 39.34901>, <-76.64695, 39.28613>, NULL, NULL, NUL...
$ long                 <dbl> NA, -76.68436, -76.64695, NA, NA, NA, NA, -76.65649, -76.66371, -76.6...
$ lat                  <dbl> NA, 39.34901, 39.28613, NA, NA, NA, NA, 39.28622, 39.30140, 39.34712,...

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